. >> reporter: it was chain's way of saying thank you to the obama campaign. chane suffered a brain tumor in 2010 while she was out of the country and uninsured. >> i started applying to every insurance plan i could, because they had to perform brain surgery to keep me alive. every plan you can think of, all of them denied me. >> reporter: in this video which she made for the obama campaign, she says the only reason she was able to get insurance for her preexisting condition was because of obamacare. >> i recovered 100% from a life- threatening brain tumor. >> reporter: chain said giving back was the least she could do as part of a day of service tradition president obama started four years ago to honor dr. martin luther king jr. >> i just wanted an opportunity to say thank you to everyone that worked so hard on the campaign. >> reporter: really a wonderful day out there on the national mall today. next we'll be heading to california's ball, talking to some of the top state legislators who will be there, about issues like gun control and the democratic super m